diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index ea3a21c8..f9c77318 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -3,25 +3,25 @@
   <ProductDependencies>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="6.0.0-beta.21379.2">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="7.0.0-beta.21559.3">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>62a8aafffd4c68ef887680f6837abdff906a662c</Sha>
+      <Sha>fecf65bedcee9036b8ba9d8d7feef5413f294914</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Build.Tasks.Feed" Version="6.0.0-beta.21379.2">
+    <Dependency Name="Microsoft.DotNet.Build.Tasks.Feed" Version="7.0.0-beta.21559.3">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>62a8aafffd4c68ef887680f6837abdff906a662c</Sha>
+      <Sha>fecf65bedcee9036b8ba9d8d7feef5413f294914</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.SignTool" Version="6.0.0-beta.21379.2">
+    <Dependency Name="Microsoft.DotNet.SignTool" Version="7.0.0-beta.21559.3">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>62a8aafffd4c68ef887680f6837abdff906a662c</Sha>
+      <Sha>fecf65bedcee9036b8ba9d8d7feef5413f294914</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Helix.Sdk" Version="6.0.0-beta.21379.2">
+    <Dependency Name="Microsoft.DotNet.Helix.Sdk" Version="7.0.0-beta.21559.3">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>62a8aafffd4c68ef887680f6837abdff906a662c</Sha>
+      <Sha>fecf65bedcee9036b8ba9d8d7feef5413f294914</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.SwaggerGenerator.MSBuild" Version="6.0.0-beta.21379.2">
+    <Dependency Name="Microsoft.DotNet.SwaggerGenerator.MSBuild" Version="7.0.0-beta.21559.3">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>62a8aafffd4c68ef887680f6837abdff906a662c</Sha>
+      <Sha>fecf65bedcee9036b8ba9d8d7feef5413f294914</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.Maestro.Client" Version="1.1.0-beta.19556.4">
       <Uri>https://github.com/dotnet/arcade-services</Uri>
diff --git a/eng/common/build.sh b/eng/common/build.sh
index 55b298f1..bc07a1c6 100755
--- a/eng/common/build.sh
+++ b/eng/common/build.sh
@@ -187,6 +187,10 @@ function InitializeCustomToolset {
 }
 
 function Build {
+
+  if [[ "$ci" == true ]]; then
+    TryLogClientIpAddress
+  fi
   InitializeToolset
   InitializeCustomToolset
 
diff --git a/eng/common/cross/build-rootfs.sh b/eng/common/cross/build-rootfs.sh
index 735a4c82..6fa2c8aa 100755
--- a/eng/common/cross/build-rootfs.sh
+++ b/eng/common/cross/build-rootfs.sh
@@ -6,10 +6,10 @@ usage()
 {
     echo "Usage: $0 [BuildArch] [CodeName] [lldbx.y] [--skipunmount] --rootfsdir <directory>]"
     echo "BuildArch can be: arm(default), armel, arm64, x86"
-    echo "CodeName - optional, Code name for Linux, can be: trusty, xenial(default), zesty, bionic, alpine, alpine3.9 or alpine3.13. If BuildArch is armel, LinuxCodeName is jessie(default) or tizen."
-    echo "                              for FreeBSD can be: freebsd11 or freebsd12."
+    echo "CodeName - optional, Code name for Linux, can be: xenial(default), zesty, bionic, alpine, alpine3.13 or alpine3.14. If BuildArch is armel, LinuxCodeName is jessie(default) or tizen."
+    echo "                              for FreeBSD can be: freebsd11, freebsd12, freebsd13"
     echo "                              for illumos can be: illumos."
-    echo "lldbx.y - optional, LLDB version, can be: lldb3.9(default), lldb4.0, lldb5.0, lldb6.0 no-lldb. Ignored for alpine and FReeBSD"
+    echo "lldbx.y - optional, LLDB version, can be: lldb3.9(default), lldb4.0, lldb5.0, lldb6.0 no-lldb. Ignored for alpine and FreeBSD"
     echo "--skipunmount - optional, will skip the unmount of rootfs folder."
     echo "--use-mirror - optional, use mirror URL to fetch resources, when available."
     exit 1
@@ -32,9 +32,9 @@ __UbuntuPackages="build-essential"
 __AlpinePackages="alpine-base"
 __AlpinePackages+=" build-base"
 __AlpinePackages+=" linux-headers"
-__AlpinePackagesEdgeCommunity=" lldb-dev"
-__AlpinePackagesEdgeMain+=" python3"
-__AlpinePackagesEdgeMain+=" libedit"
+__AlpinePackages+=" lldb-dev"
+__AlpinePackages+=" python3"
+__AlpinePackages+=" libedit"
 
 # symlinks fixer
 __UbuntuPackages+=" symlinks"
@@ -60,13 +60,15 @@ __AlpinePackages+=" krb5-dev"
 __AlpinePackages+=" openssl-dev"
 __AlpinePackages+=" zlib-dev"
 
-__FreeBSDBase="12.1-RELEASE"
+__FreeBSDBase="12.2-RELEASE"
 __FreeBSDPkg="1.12.0"
+__FreeBSDABI="12"
 __FreeBSDPackages="libunwind"
 __FreeBSDPackages+=" icu"
 __FreeBSDPackages+=" libinotify"
 __FreeBSDPackages+=" lttng-ust"
 __FreeBSDPackages+=" krb5"
+__FreeBSDPackages+=" terminfo-db"
 
 __IllumosPackages="icu-64.2nb2"
 __IllumosPackages+=" mit-krb5-1.16.2nb4"
@@ -144,11 +146,6 @@ while :; do
         no-lldb)
             unset __LLDB_Package
             ;;
-        trusty) # Ubuntu 14.04
-            if [ "$__CodeName" != "jessie" ]; then
-                __CodeName=trusty
-            fi
-            ;;
         xenial) # Ubuntu 16.04
             if [ "$__CodeName" != "jessie" ]; then
                 __CodeName=xenial
@@ -188,32 +185,34 @@ while :; do
             __UbuntuRepo=
             __Tizen=tizen
             ;;
-        alpine|alpine3.9)
+        alpine|alpine3.13)
             __CodeName=alpine
             __UbuntuRepo=
-            __AlpineVersion=3.9
-            __AlpinePackagesEdgeMain+=" llvm11-libs"
-            __AlpinePackagesEdgeMain+=" clang-libs"
+            __AlpineVersion=3.13
+            __AlpinePackages+=" llvm10-libs"
             ;;
-        alpine3.13)
+        alpine3.14)
             __CodeName=alpine
             __UbuntuRepo=
-            __AlpineVersion=3.13
-            # Alpine 3.13 has all the packages we need in the 3.13 repository
-            __AlpinePackages+=$__AlpinePackagesEdgeCommunity
-            __AlpinePackagesEdgeCommunity=
-            __AlpinePackages+=$__AlpinePackagesEdgeMain
-            __AlpinePackagesEdgeMain=
-            __AlpinePackages+=" llvm10-libs"
+            __AlpineVersion=3.14
+            __AlpinePackages+=" llvm11-libs"
             ;;
         freebsd11)
             __FreeBSDBase="11.3-RELEASE"
+            __FreeBSDABI="11"
             ;&
         freebsd12)
             __CodeName=freebsd
             __BuildArch=x64
             __SkipUnmount=1
             ;;
+        freebsd13)
+            __CodeName=freebsd
+            __FreeBSDBase="13.0-RELEASE"
+            __FreeBSDABI="13"
+            __BuildArch=x64
+            __SkipUnmount=1
+            ;;
         illumos)
             __CodeName=illumos
             __BuildArch=x64
@@ -274,26 +273,12 @@ if [[ "$__CodeName" == "alpine" ]]; then
       -U --allow-untrusted --root $__RootfsDir --arch $__AlpineArch --initdb \
       add $__AlpinePackages
 
-    if [[ -n "$__AlpinePackagesEdgeMain" ]]; then
-      $__ApkToolsDir/apk-tools-$__ApkToolsVersion/apk \
-        -X http://dl-cdn.alpinelinux.org/alpine/edge/main \
-        -U --allow-untrusted --root $__RootfsDir --arch $__AlpineArch --initdb \
-        add $__AlpinePackagesEdgeMain
-    fi
-
-    if [[ -n "$__AlpinePackagesEdgeCommunity" ]]; then
-      $__ApkToolsDir/apk-tools-$__ApkToolsVersion/apk \
-        -X http://dl-cdn.alpinelinux.org/alpine/edge/community \
-        -U --allow-untrusted --root $__RootfsDir --arch $__AlpineArch --initdb \
-        add $__AlpinePackagesEdgeCommunity
-    fi
-
     rm -r $__ApkToolsDir
 elif [[ "$__CodeName" == "freebsd" ]]; then
     mkdir -p $__RootfsDir/usr/local/etc
+    JOBS="$(getconf _NPROCESSORS_ONLN)"
     wget -O - https://download.freebsd.org/ftp/releases/amd64/${__FreeBSDBase}/base.txz | tar -C $__RootfsDir -Jxf - ./lib ./usr/lib ./usr/libdata ./usr/include ./usr/share/keys ./etc ./bin/freebsd-version
-    # For now, ask for 11 ABI even on 12. This can be revisited later.
-    echo "ABI = \"FreeBSD:11:amd64\"; FINGERPRINTS = \"${__RootfsDir}/usr/share/keys\"; REPOS_DIR = [\"${__RootfsDir}/etc/pkg\"]; REPO_AUTOUPDATE = NO; RUN_SCRIPTS = NO;" > ${__RootfsDir}/usr/local/etc/pkg.conf
+    echo "ABI = \"FreeBSD:${__FreeBSDABI}:amd64\"; FINGERPRINTS = \"${__RootfsDir}/usr/share/keys\"; REPOS_DIR = [\"${__RootfsDir}/etc/pkg\"]; REPO_AUTOUPDATE = NO; RUN_SCRIPTS = NO;" > ${__RootfsDir}/usr/local/etc/pkg.conf
     echo "FreeBSD: { url: "pkg+http://pkg.FreeBSD.org/\${ABI}/quarterly", mirror_type: \"srv\", signature_type: \"fingerprints\", fingerprints: \"${__RootfsDir}/usr/share/keys/pkg\", enabled: yes }" > ${__RootfsDir}/etc/pkg/FreeBSD.conf
     mkdir -p $__RootfsDir/tmp
     # get and build package manager
@@ -301,7 +286,7 @@ elif [[ "$__CodeName" == "freebsd" ]]; then
     cd $__RootfsDir/tmp/pkg-${__FreeBSDPkg}
     # needed for install to succeed
     mkdir -p $__RootfsDir/host/etc
-    ./autogen.sh && ./configure --prefix=$__RootfsDir/host && make && make install
+    ./autogen.sh && ./configure --prefix=$__RootfsDir/host && make -j "$JOBS" && make install
     rm -rf $__RootfsDir/tmp/pkg-${__FreeBSDPkg}
     # install packages we need.
     INSTALL_AS_USER=$(whoami) $__RootfsDir/host/sbin/pkg -r $__RootfsDir -C $__RootfsDir/usr/local/etc/pkg.conf update
@@ -364,13 +349,6 @@ elif [[ -n $__CodeName ]]; then
         umount $__RootfsDir/* || true
     fi
 
-    if [[ "$__BuildArch" == "arm" && "$__CodeName" == "trusty" ]]; then
-        pushd $__RootfsDir
-        patch -p1 < $__CrossDir/$__BuildArch/trusty.patch
-        patch -p1 < $__CrossDir/$__BuildArch/trusty-lttng-2.4.patch
-        popd
-    fi
-
     if [[ "$__BuildArch" == "armel" && "$__CodeName" == "jessie" ]]; then
         pushd $__RootfsDir
         patch -p1 < $__CrossDir/$__BuildArch/armel.jessie.patch
diff --git a/eng/common/cross/toolchain.cmake b/eng/common/cross/toolchain.cmake
index fc11001a..6501c3a9 100644
--- a/eng/common/cross/toolchain.cmake
+++ b/eng/common/cross/toolchain.cmake
@@ -44,7 +44,7 @@ elseif(TARGET_ARCH_NAME STREQUAL "x86")
   set(TOOLCHAIN "i686-linux-gnu")
 elseif (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
   set(CMAKE_SYSTEM_PROCESSOR "x86_64")
-  set(triple "x86_64-unknown-freebsd11")
+  set(triple "x86_64-unknown-freebsd12")
 elseif (ILLUMOS)
   set(CMAKE_SYSTEM_PROCESSOR "x86_64")
   set(TOOLCHAIN "x86_64-illumos")
@@ -91,6 +91,9 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
     set(CMAKE_CXX_COMPILER_TARGET ${triple})
     set(CMAKE_ASM_COMPILER_TARGET ${triple})
     set(CMAKE_SYSROOT "${CROSS_ROOTFS}")
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=lld")
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -fuse-ld=lld")
+    set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -fuse-ld=lld")
 elseif(ILLUMOS)
     set(CMAKE_SYSROOT "${CROSS_ROOTFS}")
 
@@ -138,8 +141,8 @@ function(add_toolchain_linker_flag Flag)
   if (NOT Config STREQUAL "")
     set(CONFIG_SUFFIX "_${Config}")
   endif()
-  set("CMAKE_EXE_LINKER_FLAGS${CONFIG_SUFFIX}" "${CMAKE_EXE_LINKER_FLAGS${CONFIG_SUFFIX}} ${Flag}" PARENT_SCOPE)
-  set("CMAKE_SHARED_LINKER_FLAGS${CONFIG_SUFFIX}" "${CMAKE_SHARED_LINKER_FLAGS${CONFIG_SUFFIX}} ${Flag}" PARENT_SCOPE)
+  set("CMAKE_EXE_LINKER_FLAGS${CONFIG_SUFFIX}_INIT" "${CMAKE_EXE_LINKER_FLAGS${CONFIG_SUFFIX}_INIT} ${Flag}" PARENT_SCOPE)
+  set("CMAKE_SHARED_LINKER_FLAGS${CONFIG_SUFFIX}_INIT" "${CMAKE_SHARED_LINKER_FLAGS${CONFIG_SUFFIX}_INIT} ${Flag}" PARENT_SCOPE)
 endfunction()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
diff --git a/eng/common/init-tools-native.sh b/eng/common/init-tools-native.sh
index 5bd205b5..3e6a8d6a 100755
--- a/eng/common/init-tools-native.sh
+++ b/eng/common/init-tools-native.sh
@@ -10,7 +10,7 @@ force=false
 download_retries=5
 retry_wait_time_seconds=30
 global_json_file="$(dirname "$(dirname "${scriptroot}")")/global.json"
-declare -A native_assets
+declare -a native_assets
 
 . $scriptroot/pipeline-logging-functions.sh
 . $scriptroot/native/common-library.sh
diff --git a/eng/common/internal/Tools.csproj b/eng/common/internal/Tools.csproj
index 2067b8df..beb9c464 100644
--- a/eng/common/internal/Tools.csproj
+++ b/eng/common/internal/Tools.csproj
@@ -1,5 +1,4 @@
 <!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. -->
-<?xml version="1.0" encoding="utf-8"?>
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net472</TargetFramework>
diff --git a/eng/common/msbuild.ps1 b/eng/common/msbuild.ps1
index eea19cd8..f041e5dd 100644
--- a/eng/common/msbuild.ps1
+++ b/eng/common/msbuild.ps1
@@ -6,6 +6,7 @@ Param(
   [switch] $ci,
   [switch] $prepareMachine,
   [switch] $excludePrereleaseVS,
+  [string] $msbuildEngine = $null,
   [Parameter(ValueFromRemainingArguments=$true)][String[]]$extraArgs
 )
 
diff --git a/eng/common/native/common-library.sh b/eng/common/native/common-library.sh
index bf272dcf..080c2c28 100755
--- a/eng/common/native/common-library.sh
+++ b/eng/common/native/common-library.sh
@@ -148,8 +148,12 @@ function NewScriptShim {
   fi
   
   if [[ ! -f $tool_file_path ]]; then
-    Write-PipelineTelemetryError -category 'NativeToolsBootstrap' "Specified tool file path:'$tool_file_path' does not exist"
-    return 1
+    # try to see if the path is lower cased
+    tool_file_path="$(echo $tool_file_path | tr "[:upper:]" "[:lower:]")" 
+    if [[ ! -f $tool_file_path ]]; then
+      Write-PipelineTelemetryError -category 'NativeToolsBootstrap' "Specified tool file path:'$tool_file_path' does not exist"
+      return 1
+    fi
   fi
 
   local shim_contents=$'#!/usr/bin/env bash\n'
diff --git a/eng/common/native/find-native-compiler.sh b/eng/common/native/init-compiler.sh
similarity index 52%
rename from eng/common/native/find-native-compiler.sh
rename to eng/common/native/init-compiler.sh
index aed19d07..8c944f30 100644
--- a/eng/common/native/find-native-compiler.sh
+++ b/eng/common/native/init-compiler.sh
@@ -1,39 +1,34 @@
 #!/usr/bin/env bash
 #
-# This file locates the native compiler with the given name and version and sets the environment variables to locate it.
+# This file detects the C/C++ compiler and exports it to the CC/CXX environment variables
 #
 
-source="${BASH_SOURCE[0]}"
-
-# resolve $SOURCE until the file is no longer a symlink
-while [[ -h $source ]]; do
-  scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
-  source="$(readlink "$source")"
-
-  # if $source was a relative symlink, we need to resolve it relative to the path where the
-  # symlink file was located
-  [[ $source != /* ]] && source="$scriptroot/$source"
-done
-scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
-
-if [ $# -lt 0 ]
-then
+if [[ "$#" -lt 3 ]]; then
   echo "Usage..."
-  echo "find-native-compiler.sh <compiler> <compiler major version> <compiler minor version>"
+  echo "init-compiler.sh <script directory> <Architecture> <compiler> <compiler major version> <compiler minor version>"
+  echo "Specify the script directory."
+  echo "Specify the target architecture."
   echo "Specify the name of compiler (clang or gcc)."
   echo "Specify the major version of compiler."
   echo "Specify the minor version of compiler."
   exit 1
 fi
 
-. $scriptroot/../pipeline-logging-functions.sh
-
-compiler="$1"
+nativescriptroot="$1"
+build_arch="$2"
+compiler="$3"
 cxxCompiler="$compiler++"
-majorVersion="$2"
-minorVersion="$3"
+majorVersion="$4"
+minorVersion="$5"
+
+. "$nativescriptroot"/../pipeline-logging-functions.sh
+
+# clear the existing CC and CXX from environment
+CC=
+CXX=
+LDFLAGS=
 
-if [ "$compiler" = "gcc" ]; then cxxCompiler="g++"; fi
+if [[ "$compiler" == "gcc" ]]; then cxxCompiler="g++"; fi
 
 check_version_exists() {
     desired_version=-1
@@ -50,38 +45,38 @@ check_version_exists() {
     echo "$desired_version"
 }
 
-if [ -z "$CLR_CC" ]; then
+if [[ -z "$CLR_CC" ]]; then
 
     # Set default versions
-    if [ -z "$majorVersion" ]; then
+    if [[ -z "$majorVersion" ]]; then
         # note: gcc (all versions) and clang versions higher than 6 do not have minor version in file name, if it is zero.
-        if [ "$compiler" = "clang" ]; then versions=( 9 8 7 6.0 5.0 4.0 3.9 3.8 3.7 3.6 3.5 )
-        elif [ "$compiler" = "gcc" ]; then versions=( 9 8 7 6 5 4.9 ); fi
+        if [[ "$compiler" == "clang" ]]; then versions=( 13 12 11 10 9 8 7 6.0 5.0 4.0 3.9 3.8 3.7 3.6 3.5 )
+        elif [[ "$compiler" == "gcc" ]]; then versions=( 12 11 10 9 8 7 6 5 4.9 ); fi
 
         for version in "${versions[@]}"; do
             parts=(${version//./ })
             desired_version="$(check_version_exists "${parts[0]}" "${parts[1]}")"
-            if [ "$desired_version" != "-1" ]; then majorVersion="${parts[0]}"; break; fi
+            if [[ "$desired_version" != "-1" ]]; then majorVersion="${parts[0]}"; break; fi
         done
 
-        if [ -z "$majorVersion" ]; then
+        if [[ -z "$majorVersion" ]]; then
             if command -v "$compiler" > /dev/null; then
-                if [ "$(uname)" != "Darwin" ]; then
+                if [[ "$(uname)" != "Darwin" ]]; then
                     Write-PipelineTelemetryError -category "Build" -type "warning" "Specific version of $compiler not found, falling back to use the one in PATH."
                 fi
-                export CC="$(command -v "$compiler")"
-                export CXX="$(command -v "$cxxCompiler")"
+                CC="$(command -v "$compiler")"
+                CXX="$(command -v "$cxxCompiler")"
             else
                 Write-PipelineTelemetryError -category "Build" "No usable version of $compiler found."
                 exit 1
             fi
         else
-            if [ "$compiler" = "clang" ] && [ "$majorVersion" -lt 5 ]; then
-                if [ "$build_arch" = "arm" ] || [ "$build_arch" = "armel" ]; then
+            if [[ "$compiler" == "clang" && "$majorVersion" -lt 5 ]]; then
+                if [[ "$build_arch" == "arm" || "$build_arch" == "armel" ]]; then
                     if command -v "$compiler" > /dev/null; then
                         Write-PipelineTelemetryError -category "Build" -type "warning" "Found clang version $majorVersion which is not supported on arm/armel architectures, falling back to use clang from PATH."
-                        export CC="$(command -v "$compiler")"
-                        export CXX="$(command -v "$cxxCompiler")"
+                        CC="$(command -v "$compiler")"
+                        CXX="$(command -v "$cxxCompiler")"
                     else
                         Write-PipelineTelemetryError -category "Build" "Found clang version $majorVersion which is not supported on arm/armel architectures, and there is no clang in PATH."
                         exit 1
@@ -91,31 +86,40 @@ if [ -z "$CLR_CC" ]; then
         fi
     else
         desired_version="$(check_version_exists "$majorVersion" "$minorVersion")"
-        if [ "$desired_version" = "-1" ]; then
+        if [[ "$desired_version" == "-1" ]]; then
             Write-PipelineTelemetryError -category "Build" "Could not find specific version of $compiler: $majorVersion $minorVersion."
             exit 1
         fi
     fi
 
-    if [ -z "$CC" ]; then
-        export CC="$(command -v "$compiler$desired_version")"
-        export CXX="$(command -v "$cxxCompiler$desired_version")"
-        if [ -z "$CXX" ]; then export CXX="$(command -v "$cxxCompiler")"; fi
+    if [[ -z "$CC" ]]; then
+        CC="$(command -v "$compiler$desired_version")"
+        CXX="$(command -v "$cxxCompiler$desired_version")"
+        if [[ -z "$CXX" ]]; then CXX="$(command -v "$cxxCompiler")"; fi
     fi
 else
-    if [ ! -f "$CLR_CC" ]; then
+    if [[ ! -f "$CLR_CC" ]]; then
         Write-PipelineTelemetryError -category "Build" "CLR_CC is set but path '$CLR_CC' does not exist"
         exit 1
     fi
-    export CC="$CLR_CC"
-    export CXX="$CLR_CXX"
+    CC="$CLR_CC"
+    CXX="$CLR_CXX"
 fi
 
-if [ -z "$CC" ]; then
-   Write-PipelineTelemetryError -category "Build" "Unable to find $compiler."
+if [[ -z "$CC" ]]; then
+    Write-PipelineTelemetryError -category "Build" "Unable to find $compiler."
     exit 1
 fi
 
-export CCC_CC="$CC"
-export CCC_CXX="$CXX"
-export SCAN_BUILD_COMMAND="$(command -v "scan-build$desired_version")"
+if [[ "$compiler" == "clang" ]]; then
+    if command -v "lld$desired_version" > /dev/null; then
+        # Only lld version >= 9 can be considered stable
+        if [[ "$majorVersion" -ge 9 ]]; then
+            LDFLAGS="-fuse-ld=lld"
+        fi
+    fi
+fi
+
+SCAN_BUILD_COMMAND="$(command -v "scan-build$desired_version")"
+
+export CC CXX LDFLAGS SCAN_BUILD_COMMAND
diff --git a/eng/common/post-build/sourcelink-validation.ps1 b/eng/common/post-build/sourcelink-validation.ps1
index 85c89861..4011d324 100644
--- a/eng/common/post-build/sourcelink-validation.ps1
+++ b/eng/common/post-build/sourcelink-validation.ps1
@@ -17,10 +17,16 @@ $global:RepoFiles = @{}
 $MaxParallelJobs = 16
 
 $MaxRetries = 5
+$RetryWaitTimeInSeconds = 30
 
 # Wait time between check for system load
 $SecondsBetweenLoadChecks = 10
 
+if (!$InputPath -or !(Test-Path $InputPath)){
+  Write-Host "No files to validate."
+  ExitWithExitCode 0
+}
+
 $ValidatePackage = {
   param( 
     [string] $PackagePath                                 # Full path to a Symbols.NuGet package
@@ -99,21 +105,25 @@ $ValidatePackage = {
                     $Status = 200
                     $Cache = $using:RepoFiles
 
-                    $totalRetries = 0
+                    $attempts = 0
 
-                    while ($totalRetries -lt $using:MaxRetries) {
+                    while ($attempts -lt $using:MaxRetries) {
                       if ( !($Cache.ContainsKey($FilePath)) ) {
                         try {
                           $Uri = $Link -as [System.URI]
                         
-                          # Only GitHub links are valid
-                          if ($Uri.AbsoluteURI -ne $null -and ($Uri.Host -match 'github' -or $Uri.Host -match 'githubusercontent')) {
+                          if ($Link -match "submodules") {
+                            # Skip submodule links until sourcelink properly handles submodules
+                            $Status = 200
+                          }
+                          elseif ($Uri.AbsoluteURI -ne $null -and ($Uri.Host -match 'github' -or $Uri.Host -match 'githubusercontent')) {
+                            # Only GitHub links are valid
                             $Status = (Invoke-WebRequest -Uri $Link -UseBasicParsing -Method HEAD -TimeoutSec 5).StatusCode
                           }
                           else {
                             # If it's not a github link, we want to break out of the loop and not retry.
                             $Status = 0
-                            $totalRetries = $using:MaxRetries
+                            $attempts = $using:MaxRetries
                           }
                         }
                         catch {
@@ -123,9 +133,15 @@ $ValidatePackage = {
                       }
 
                       if ($Status -ne 200) {
-                        $totalRetries++
+                        $attempts++
                         
-                        if ($totalRetries -ge $using:MaxRetries) {
+                        if  ($attempts -lt $using:MaxRetries)
+                        {
+                          $attemptsLeft = $using:MaxRetries - $attempts
+                          Write-Warning "Download failed, $attemptsLeft attempts remaining, will retry in $using:RetryWaitTimeInSeconds seconds"
+                          Start-Sleep -Seconds $using:RetryWaitTimeInSeconds
+                        }
+                        else {
                           if ($NumFailedLinks -eq 0) {
                             if ($FailedFiles.Value -eq 0) {
                               Write-Host
diff --git a/eng/common/post-build/symbols-validation.ps1 b/eng/common/post-build/symbols-validation.ps1
index a5af041b..cd2181ba 100644
--- a/eng/common/post-build/symbols-validation.ps1
+++ b/eng/common/post-build/symbols-validation.ps1
@@ -4,9 +4,11 @@ param(
   [Parameter(Mandatory = $true)][string] $DotnetSymbolVersion, # Version of dotnet symbol to use
   [Parameter(Mandatory = $false)][switch] $CheckForWindowsPdbs, # If we should check for the existence of windows pdbs in addition to portable PDBs
   [Parameter(Mandatory = $false)][switch] $ContinueOnError, # If we should keep checking symbols after an error
-  [Parameter(Mandatory = $false)][switch] $Clean                  # Clean extracted symbols directory after checking symbols
+  [Parameter(Mandatory = $false)][switch] $Clean,           # Clean extracted symbols directory after checking symbols
+  [Parameter(Mandatory = $false)][string] $SymbolExclusionFile  # Exclude the symbols in the file from publishing to symbol server
 )
 
+. $PSScriptRoot\..\tools.ps1
 # Maximum number of jobs to run in parallel
 $MaxParallelJobs = 16
 
@@ -25,14 +27,28 @@ if ($CheckForWindowsPdbs) {
   $WindowsPdbVerificationParam = "--windows-pdbs"
 }
 
+$ExclusionSet = New-Object System.Collections.Generic.HashSet[string];
+
+if (!$InputPath -or !(Test-Path $InputPath)){
+  Write-Host "No symbols to validate."
+  ExitWithExitCode 0
+}
+
+#Check if the path exists
+if ($SymbolExclusionFile -and (Test-Path $SymbolExclusionFile)){
+  [string[]]$Exclusions = Get-Content "$SymbolExclusionFile"
+  $Exclusions | foreach { if($_ -and $_.Trim()){$ExclusionSet.Add($_)} }
+}
+else{
+  Write-Host "Symbol Exclusion file does not exists. No symbols to exclude."
+}
+
 $CountMissingSymbols = {
   param( 
     [string] $PackagePath, # Path to a NuGet package
     [string] $WindowsPdbVerificationParam # If we should check for the existence of windows pdbs in addition to portable PDBs
   )
 
-  . $using:PSScriptRoot\..\tools.ps1
-
   Add-Type -AssemblyName System.IO.Compression.FileSystem
 
   Write-Host "Validating $PackagePath "
@@ -118,17 +134,17 @@ $CountMissingSymbols = {
         # Save the output and get diagnostic output
         $output = & $dotnetSymbolExe --symbols --modules $WindowsPdbVerificationParam $TargetServerParam $FullPath -o $SymbolsPath --diagnostics | Out-String
 
-        if (Test-Path $PdbPath) {
-          return 'PDB'
+        if ((Test-Path $PdbPath) -and (Test-path $SymbolPath)) {
+          return 'Module and PDB for Module'
         }
-        elseif (Test-Path $NGenPdb) {
-          return 'NGen PDB'
+        elseif ((Test-Path $NGenPdb) -and (Test-Path $PdbPath) -and (Test-Path $SymbolPath)) {
+          return 'Dll, PDB and NGen PDB'
         }
-        elseif (Test-Path $SODbg) {
-          return 'DBG for SO'
+        elseif ((Test-Path $SODbg) -and (Test-Path $SymbolPath)) {
+          return 'So and DBG for SO'
         }  
-        elseif (Test-Path $DylibDwarf) {
-          return 'Dwarf for Dylib'
+        elseif ((Test-Path $DylibDwarf) -and (Test-Path $SymbolPath)) {
+          return 'Dylib and Dwarf for Dylib'
         }  
         elseif (Test-Path $SymbolPath) {
           return 'Module'
@@ -142,37 +158,44 @@ $CountMissingSymbols = {
       return $null
     }
 
-    $FileGuid = New-Guid
-    $ExpandedSymbolsPath = Join-Path -Path $SymbolsPath -ChildPath $FileGuid
-
-    $SymbolsOnMSDL = & $FirstMatchingSymbolDescriptionOrDefault `
-        -FullPath $FileName `
-        -TargetServerParam '--microsoft-symbol-server' `
-        -SymbolsPath "$ExpandedSymbolsPath-msdl" `
-        -WindowsPdbVerificationParam $WindowsPdbVerificationParam
-    $SymbolsOnSymWeb = & $FirstMatchingSymbolDescriptionOrDefault `
-        -FullPath $FileName `
-        -TargetServerParam '--internal-server' `
-        -SymbolsPath "$ExpandedSymbolsPath-symweb" `
-        -WindowsPdbVerificationParam $WindowsPdbVerificationParam
-
-    Write-Host -NoNewLine "`t Checking file " $FileName "... "
-  
-    if ($SymbolsOnMSDL -ne $null -and $SymbolsOnSymWeb -ne $null) {
-      Write-Host "Symbols found on MSDL ($SymbolsOnMSDL) and SymWeb ($SymbolsOnSymWeb)"
+    $FileRelativePath = $FileName.Replace("$ExtractPath\", "")
+    if (($($using:ExclusionSet) -ne $null) -and ($($using:ExclusionSet).Contains($FileRelativePath) -or ($($using:ExclusionSet).Contains($FileRelativePath.Replace("\", "/"))))){
+      Write-Host "Skipping $FileName from symbol validation"
     }
-    else {
-      $MissingSymbols++
 
-      if ($SymbolsOnMSDL -eq $null -and $SymbolsOnSymWeb -eq $null) {
-        Write-Host 'No symbols found on MSDL or SymWeb!'
+    else {
+      $FileGuid = New-Guid
+      $ExpandedSymbolsPath = Join-Path -Path $SymbolsPath -ChildPath $FileGuid
+
+      $SymbolsOnMSDL = & $FirstMatchingSymbolDescriptionOrDefault `
+          -FullPath $FileName `
+          -TargetServerParam '--microsoft-symbol-server' `
+          -SymbolsPath "$ExpandedSymbolsPath-msdl" `
+          -WindowsPdbVerificationParam $WindowsPdbVerificationParam
+      $SymbolsOnSymWeb = & $FirstMatchingSymbolDescriptionOrDefault `
+          -FullPath $FileName `
+          -TargetServerParam '--internal-server' `
+          -SymbolsPath "$ExpandedSymbolsPath-symweb" `
+          -WindowsPdbVerificationParam $WindowsPdbVerificationParam
+
+      Write-Host -NoNewLine "`t Checking file " $FileName "... "
+  
+      if ($SymbolsOnMSDL -ne $null -and $SymbolsOnSymWeb -ne $null) {
+        Write-Host "Symbols found on MSDL ($SymbolsOnMSDL) and SymWeb ($SymbolsOnSymWeb)"
       }
       else {
-        if ($SymbolsOnMSDL -eq $null) {
-          Write-Host 'No symbols found on MSDL!'
+        $MissingSymbols++
+
+        if ($SymbolsOnMSDL -eq $null -and $SymbolsOnSymWeb -eq $null) {
+          Write-Host 'No symbols found on MSDL or SymWeb!'
         }
         else {
-          Write-Host 'No symbols found on SymWeb!'
+          if ($SymbolsOnMSDL -eq $null) {
+            Write-Host 'No symbols found on MSDL!'
+          }
+          else {
+            Write-Host 'No symbols found on SymWeb!'
+          }
         }
       }
     }
diff --git a/eng/common/sdk-task.ps1 b/eng/common/sdk-task.ps1
index b1bca63a..7ab9baac 100644
--- a/eng/common/sdk-task.ps1
+++ b/eng/common/sdk-task.ps1
@@ -83,6 +83,9 @@ try {
   }
 
   if ($restore) {
+    if ($ci) {
+      Try-LogClientIpAddress
+    }
     Build 'Restore'
   }
 
diff --git a/eng/common/sdl/configure-sdl-tool.ps1 b/eng/common/sdl/configure-sdl-tool.ps1
index 4999c307..8a68fc24 100644
--- a/eng/common/sdl/configure-sdl-tool.ps1
+++ b/eng/common/sdl/configure-sdl-tool.ps1
@@ -69,13 +69,13 @@ try {
     # For some tools, add default and automatic args.
     if ($tool.Name -eq 'credscan') {
       if ($targetDirectory) {
-        $tool.Args += "TargetDirectory < $TargetDirectory"
+        $tool.Args += "`"TargetDirectory < $TargetDirectory`""
       }
-      $tool.Args += "OutputType < pre"
+      $tool.Args += "`"OutputType < pre`""
       $tool.Args += $CrScanAdditionalRunConfigParams
     } elseif ($tool.Name -eq 'policheck') {
       if ($targetDirectory) {
-        $tool.Args += "Target < $TargetDirectory"
+        $tool.Args += "`"Target < $TargetDirectory`""
       }
       $tool.Args += $PoliCheckAdditionalRunConfigParams
     }
diff --git a/eng/common/templates/job/execute-sdl.yml b/eng/common/templates/job/execute-sdl.yml
index 69eb6784..3aafc82e 100644
--- a/eng/common/templates/job/execute-sdl.yml
+++ b/eng/common/templates/job/execute-sdl.yml
@@ -60,11 +60,7 @@ jobs:
     - name: GuardianPackagesConfigFile
       value: $(Build.SourcesDirectory)\eng\common\sdl\packages.config
   pool:
-    # To extract archives (.tar.gz, .zip), we need access to "tar", added in Windows 10/2019.
-    ${{ if eq(parameters.extractArchiveArtifacts, 'false') }}:
-      name: Hosted VS2017
-    ${{ if ne(parameters.extractArchiveArtifacts, 'false') }}:
-      vmImage: windows-2019
+    vmImage: windows-2019
   steps:
   - checkout: self
     clean: true
diff --git a/eng/common/templates/job/job.yml b/eng/common/templates/job/job.yml
index 86696793..37dceb1b 100644
--- a/eng/common/templates/job/job.yml
+++ b/eng/common/templates/job/job.yml
@@ -103,7 +103,7 @@ jobs:
 
   - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
     - ${{ if eq(parameters.enableMicrobuild, 'true') }}:
-      - task: MicroBuildSigningPlugin@2
+      - task: MicroBuildSigningPlugin@3
         displayName: Install MicroBuild plugin
         inputs:
           signType: $(_SignType)
diff --git a/eng/common/templates/job/onelocbuild.yml b/eng/common/templates/job/onelocbuild.yml
index e8bc77d2..c4fc18b3 100644
--- a/eng/common/templates/job/onelocbuild.yml
+++ b/eng/common/templates/job/onelocbuild.yml
@@ -4,7 +4,7 @@ parameters:
 
   # Optional: A defined YAML pool - https://docs.microsoft.com/en-us/azure/devops/pipelines/yaml-schema?view=vsts&tabs=schema#pool
   pool:
-    vmImage: vs2017-win2016
+    vmImage: 'windows-2019'
 
   CeapexPat: $(dn-bot-ceapex-package-r) # PAT for the loc AzDO instance https://dev.azure.com/ceapex
   GithubPat: $(BotAccount-dotnet-bot-repo-PAT)
@@ -12,6 +12,7 @@ parameters:
   SourcesDirectory: $(Build.SourcesDirectory)
   CreatePr: true
   AutoCompletePr: false
+  ReusePr: true
   UseLfLineEndings: true
   UseCheckedInLocProjectJson: false
   LanguageSet: VS_Main_Languages
@@ -64,6 +65,8 @@ jobs:
         ${{ if eq(parameters.CreatePr, true) }}:
           isAutoCompletePrSelected: ${{ parameters.AutoCompletePr }}
           isUseLfLineEndingsSelected: ${{ parameters.UseLfLineEndings }}
+          ${{ if eq(parameters.RepoType, 'gitHub') }}:
+            isShouldReusePrSelected: ${{ parameters.ReusePr }}
         packageSourceAuth: patAuth
         patVariable: ${{ parameters.CeapexPat }}
         ${{ if eq(parameters.RepoType, 'gitHub') }}:
diff --git a/eng/common/templates/job/publish-build-assets.yml b/eng/common/templates/job/publish-build-assets.yml
index 3b9e2524..fe9dfdf7 100644
--- a/eng/common/templates/job/publish-build-assets.yml
+++ b/eng/common/templates/job/publish-build-assets.yml
@@ -94,7 +94,31 @@ jobs:
         PathtoPublish: '$(Build.StagingDirectory)/ReleaseConfigs.txt'
         PublishLocation: Container
         ArtifactName: ReleaseConfigs
-    
+
+    - task: powershell@2
+      displayName: Check if SymbolPublishingExclusionsFile.txt exists
+      inputs:
+        targetType: inline
+        script: |
+          $symbolExclusionfile = "$(Build.SourcesDirectory)/eng/SymbolPublishingExclusionsFile.txt"
+          if(Test-Path -Path $symbolExclusionfile)
+          {
+            Write-Host "SymbolExclusionFile exists"
+            Write-Host "##vso[task.setvariable variable=SymbolExclusionFile]true"
+          }
+          else{
+           Write-Host "Symbols Exclusion file does not exists"
+           Write-Host "##vso[task.setvariable variable=SymbolExclusionFile]false"
+          }
+
+    - task: PublishBuildArtifacts@1
+      displayName: Publish SymbolPublishingExclusionsFile Artifact
+      condition: eq(variables['SymbolExclusionFile'], 'true') 
+      inputs:
+        PathtoPublish: '$(Build.SourcesDirectory)/eng/SymbolPublishingExclusionsFile.txt'
+        PublishLocation: Container
+        ArtifactName: ReleaseConfigs
+        
     - ${{ if eq(parameters.enablePublishBuildArtifacts, 'true') }}:
       - template: /eng/common/templates/steps/publish-logs.yml
         parameters:
diff --git a/eng/common/templates/job/source-build.yml b/eng/common/templates/job/source-build.yml
index 5023d36d..5cd5325d 100644
--- a/eng/common/templates/job/source-build.yml
+++ b/eng/common/templates/job/source-build.yml
@@ -31,11 +31,6 @@ parameters:
   #   container and pool.
   platform: {}
 
-  # The default VM host AzDO pool. This should be capable of running Docker containers: almost all
-  # source-build builds run in Docker, including the default managed platform.
-  defaultContainerHostPool:
-    vmImage: ubuntu-20.04
-
 jobs:
 - job: ${{ parameters.jobNamePrefix }}_${{ parameters.platform.name }}
   displayName: Source-Build (${{ parameters.platform.name }})
@@ -47,7 +42,15 @@ jobs:
     container: ${{ parameters.platform.container }}
 
   ${{ if eq(parameters.platform.pool, '') }}:
-    pool: ${{ parameters.defaultContainerHostPool }}
+    # The default VM host AzDO pool. This should be capable of running Docker containers: almost all
+    # source-build builds run in Docker, including the default managed platform.
+    pool:
+      ${{ if eq(variables['System.TeamProject'], 'public') }}:
+        name: NetCore1ESPool-Public
+        demands: ImageOverride -equals Build.Ubuntu.1804.Amd64.Open
+      ${{ if eq(variables['System.TeamProject'], 'internal') }}:
+        name: NetCore1ESPool-Internal
+        demands: ImageOverride -equals Build.Ubuntu.1804.Amd64
   ${{ if ne(parameters.platform.pool, '') }}:
     pool: ${{ parameters.platform.pool }}
 
diff --git a/eng/common/templates/job/source-index-stage1.yml b/eng/common/templates/job/source-index-stage1.yml
index b58d4236..4af724eb 100644
--- a/eng/common/templates/job/source-index-stage1.yml
+++ b/eng/common/templates/job/source-index-stage1.yml
@@ -5,8 +5,6 @@ parameters:
   sourceIndexBuildCommand: powershell -NoLogo -NoProfile -ExecutionPolicy Bypass -Command "eng/common/build.ps1 -restore -build -binarylog -ci"
   preSteps: []
   binlogPath: artifacts/log/Debug/Build.binlog
-  pool:
-    vmImage: vs2017-win2016
   condition: ''
   dependsOn: ''
 
@@ -24,7 +22,13 @@ jobs:
   - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
     - group: source-dot-net stage1 variables
 
-  pool: ${{ parameters.pool }}
+  pool:
+    ${{ if eq(variables['System.TeamProject'], 'public') }}:
+      name: NetCore1ESPool-Public
+      demands: ImageOverride -equals Build.Server.Amd64.VS2019.Open
+    ${{ if eq(variables['System.TeamProject'], 'internal') }}:
+      name: NetCore1ESPool-Internal
+      demands: ImageOverride -equals Build.Server.Amd64.VS2019
   steps:
   - ${{ each preStep in parameters.preSteps }}:
     - ${{ preStep }}
@@ -34,29 +38,24 @@ jobs:
     inputs:
       packageType: sdk
       version: 3.1.x
-
-  - task: UseDotNet@2
-    displayName: Use .NET Core sdk
-    inputs:
-      useGlobalJson: true
+      installationPath: $(Agent.TempDirectory)/dotnet
+      workingDirectory: $(Agent.TempDirectory)
 
   - script: |
-      dotnet tool install BinLogToSln --version $(SourceIndexPackageVersion) --add-source $(SourceIndexPackageSource) --tool-path .source-index/tools
-      dotnet tool install UploadIndexStage1 --version $(SourceIndexPackageVersion) --add-source $(SourceIndexPackageSource) --tool-path .source-index/tools
-      echo ##vso[task.prependpath]$(Build.SourcesDirectory)/.source-index/tools
+      $(Agent.TempDirectory)/dotnet/dotnet tool install BinLogToSln --version $(SourceIndexPackageVersion) --add-source $(SourceIndexPackageSource) --tool-path $(Agent.TempDirectory)/.source-index/tools
+      $(Agent.TempDirectory)/dotnet/dotnet tool install UploadIndexStage1 --version $(SourceIndexPackageVersion) --add-source $(SourceIndexPackageSource) --tool-path $(Agent.TempDirectory)/.source-index/tools
     displayName: Download Tools
+    # Set working directory to temp directory so 'dotnet' doesn't try to use global.json and use the repo's sdk.
+    workingDirectory: $(Agent.TempDirectory)
 
   - script: ${{ parameters.sourceIndexBuildCommand }}
     displayName: Build Repository
 
-  - script: BinLogToSln -i $(BinlogPath) -r $(Build.SourcesDirectory) -n $(Build.Repository.Name) -o .source-index/stage1output
+  - script: $(Agent.TempDirectory)/.source-index/tools/BinLogToSln -i $(BinlogPath) -r $(Build.SourcesDirectory) -n $(Build.Repository.Name) -o .source-index/stage1output
     displayName: Process Binlog into indexable sln
-    env:
-      DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX: 2
 
   - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
-    - script: UploadIndexStage1 -i .source-index/stage1output -n $(Build.Repository.Name)
+    - script: $(Agent.TempDirectory)/.source-index/tools/UploadIndexStage1 -i .source-index/stage1output -n $(Build.Repository.Name)
       displayName: Upload stage1 artifacts to source index
       env:
         BLOB_CONTAINER_URL: $(source-dot-net-stage1-blob-container-url)
-        DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX: 2
diff --git a/eng/common/templates/jobs/jobs.yml b/eng/common/templates/jobs/jobs.yml
index a1f8fce9..8dd1fdbd 100644
--- a/eng/common/templates/jobs/jobs.yml
+++ b/eng/common/templates/jobs/jobs.yml
@@ -83,7 +83,7 @@ jobs:
         - ${{ if eq(parameters.enableSourceBuild, true) }}:
           - Source_Build_Complete
         pool:
-          vmImage: vs2017-win2016
+          vmImage: 'windows-2019'
         runAsPublic: ${{ parameters.runAsPublic }}
         publishUsingPipelines: ${{ parameters.enablePublishUsingPipelines }}
         enablePublishBuildArtifacts: ${{ parameters.enablePublishBuildArtifacts }}
@@ -96,4 +96,4 @@ jobs:
         dependsOn:
           - Asset_Registry_Publish
         pool:
-          vmImage: vs2017-win2016
+          vmImage: 'windows-2019'
diff --git a/eng/common/templates/phases/base.yml b/eng/common/templates/phases/base.yml
deleted file mode 100644
index 0123cf43..00000000
--- a/eng/common/templates/phases/base.yml
+++ /dev/null
@@ -1,130 +0,0 @@
-parameters:
-  # Optional: Clean sources before building
-  clean: true
-
-  # Optional: Git fetch depth
-  fetchDepth: ''
-
-  # Optional: name of the phase (not specifying phase name may cause name collisions)
-  name: ''
-  # Optional: display name of the phase
-  displayName: ''
-
-  # Optional: condition for the job to run
-  condition: ''
-
-  # Optional: dependencies of the phase
-  dependsOn: ''
-
-  # Required: A defined YAML queue
-  queue: {}
-
-  # Required: build steps
-  steps: []
-
-  # Optional: variables
-  variables: {}
-
-  # Optional: should run as a public build even in the internal project
-  #           if 'true', the build won't run any of the internal only steps, even if it is running in non-public projects.
-  runAsPublic: false
-
-  ## Telemetry variables
-
-  # Optional: enable sending telemetry
-  #           if 'true', these "variables" must be specified in the variables object or as part of the queue matrix
-  #             _HelixBuildConfig - differentiate between Debug, Release, other
-  #             _HelixSource - Example: build/product
-  #             _HelixType - Example: official/dotnet/arcade/$(Build.SourceBranch)
-  enableTelemetry: false
-
-  # Optional: Enable installing Microbuild plugin
-  #           if 'true', these "variables" must be specified in the variables object or as part of the queue matrix
-  #             _TeamName - the name of your team
-  #             _SignType - 'test' or 'real'
-  enableMicrobuild: false
-
-# Internal resources (telemetry, microbuild) can only be accessed from non-public projects,
-# and some (Microbuild) should only be applied to non-PR cases for internal builds.
-
-phases:
-- phase: ${{ parameters.name }}
-
-  ${{ if ne(parameters.displayName, '') }}:
-    displayName: ${{ parameters.displayName }}
-
-  ${{ if ne(parameters.condition, '') }}:
-    condition: ${{ parameters.condition }}
-
-  ${{ if ne(parameters.dependsOn, '') }}:
-    dependsOn: ${{ parameters.dependsOn }}
-
-  queue: ${{ parameters.queue }}
-
-  ${{ if ne(parameters.variables, '') }}:
-    variables:
-      ${{ insert }}: ${{ parameters.variables }}
-
-  steps:
-  - checkout: self
-    clean: ${{ parameters.clean }}
-    ${{ if ne(parameters.fetchDepth, '') }}:
-      fetchDepth: ${{ parameters.fetchDepth }}
-
-  - ${{ if eq(parameters.enableTelemetry, 'true') }}:
-    - template: /eng/common/templates/steps/telemetry-start.yml
-      parameters:
-        buildConfig: $(_HelixBuildConfig)
-        helixSource: $(_HelixSource)
-        helixType: $(_HelixType)
-        runAsPublic: ${{ parameters.runAsPublic }}
-
-  - ${{ if eq(parameters.enableMicrobuild, 'true') }}:
-    # Internal only resource, and Microbuild signing shouldn't be applied to PRs.
-    - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
-      - task: MicroBuildSigningPlugin@2
-        displayName: Install MicroBuild plugin
-        inputs:
-          signType: $(_SignType)
-          zipSources: false
-          feedSource: https://dnceng.pkgs.visualstudio.com/_packaging/MicroBuildToolset/nuget/v3/index.json
-          
-        env:
-          TeamName: $(_TeamName)
-        continueOnError: false
-        condition: and(succeeded(), in(variables['_SignType'], 'real', 'test'), eq(variables['Agent.Os'], 'Windows_NT'))
-
-  # Run provided build steps
-  - ${{ parameters.steps }}
-
-  - ${{ if eq(parameters.enableMicrobuild, 'true') }}:
-    # Internal only resources
-    - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
-      - task: MicroBuildCleanup@1
-        displayName: Execute Microbuild cleanup tasks  
-        condition: and(always(), in(variables['_SignType'], 'real', 'test'), eq(variables['Agent.Os'], 'Windows_NT'))
-        env:
-          TeamName: $(_TeamName)
-
-  - ${{ if eq(parameters.enableTelemetry, 'true') }}:
-    - template: /eng/common/templates/steps/telemetry-end.yml
-      parameters:
-        helixSource: $(_HelixSource)
-        helixType: $(_HelixType)
-
-  - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
-    - task: CopyFiles@2
-      displayName: Gather Asset Manifests
-      inputs:
-        SourceFolder: '$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)/AssetManifest'
-        TargetFolder: '$(Build.StagingDirectory)/AssetManifests'
-      continueOnError: false
-      condition: and(succeeded(), eq(variables['_DotNetPublishToBlobFeed'], 'true'))
-    - task: PublishBuildArtifacts@1
-      displayName: Push Asset Manifests
-      inputs:
-        PathtoPublish: '$(Build.StagingDirectory)/AssetManifests'
-        PublishLocation: Container
-        ArtifactName: AssetManifests
-      continueOnError: false
-      condition: and(succeeded(), eq(variables['_DotNetPublishToBlobFeed'], 'true'))
diff --git a/eng/common/templates/phases/publish-build-assets.yml b/eng/common/templates/phases/publish-build-assets.yml
deleted file mode 100644
index 4e51e472..00000000
--- a/eng/common/templates/phases/publish-build-assets.yml
+++ /dev/null
@@ -1,52 +0,0 @@
-parameters:
-  dependsOn: ''
-  queue: {}
-  configuration: 'Debug'
-  condition: succeeded()
-  continueOnError: false
-  runAsPublic: false
-  publishUsingPipelines: false
-phases:
-  - phase: Asset_Registry_Publish
-    displayName: Publish to Build Asset Registry
-    dependsOn: ${{ parameters.dependsOn }}
-    queue: ${{ parameters.queue }}
-    variables:
-      _BuildConfig: ${{ parameters.configuration }}
-    steps:
-      - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
-        - task: DownloadBuildArtifacts@0
-          displayName: Download artifact
-          inputs:
-            artifactName: AssetManifests
-            downloadPath: '$(Build.StagingDirectory)/Download'
-            checkDownloadedFiles: true
-          condition: ${{ parameters.condition }}
-          continueOnError: ${{ parameters.continueOnError }}
-        - task: AzureKeyVault@1
-          inputs:
-            azureSubscription: 'DotNet-Engineering-Services_KeyVault'
-            KeyVaultName: EngKeyVault
-            SecretsFilter: 'MaestroAccessToken'
-          condition: ${{ parameters.condition }}
-          continueOnError: ${{ parameters.continueOnError }}
-        - task: PowerShell@2
-          displayName: Publish Build Assets
-          inputs:
-            filePath: eng\common\sdk-task.ps1
-            arguments: -task PublishBuildAssets -restore -msbuildEngine dotnet
-              /p:ManifestsPath='$(Build.StagingDirectory)/Download/AssetManifests'
-              /p:BuildAssetRegistryToken=$(MaestroAccessToken)
-              /p:MaestroApiEndpoint=https://maestro-prod.westus2.cloudapp.azure.com
-              /p:PublishUsingPipelines=${{ parameters.publishUsingPipelines }}
-              /p:Configuration=$(_BuildConfig)
-          condition: ${{ parameters.condition }}
-          continueOnError: ${{ parameters.continueOnError }}
-        - task: PublishBuildArtifacts@1
-          displayName: Publish Logs to VSTS
-          inputs:
-            PathtoPublish: '$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)'
-            PublishLocation: Container
-            ArtifactName: $(Agent.Os)_Asset_Registry_Publish
-          continueOnError: true
-          condition: always()
diff --git a/eng/common/templates/steps/send-to-helix.yml b/eng/common/templates/steps/send-to-helix.yml
index cd02ae16..09a22398 100644
--- a/eng/common/templates/steps/send-to-helix.yml
+++ b/eng/common/templates/steps/send-to-helix.yml
@@ -20,7 +20,6 @@ parameters:
   IncludeDotNetCli: false                # optional -- true will download a version of the .NET CLI onto the Helix machine as a correlation payload; requires DotNetCliPackageType and DotNetCliVersion
   DotNetCliPackageType: ''               # optional -- either 'sdk', 'runtime' or 'aspnetcore-runtime'; determines whether the sdk or runtime will be sent to Helix; see https://raw.githubusercontent.com/dotnet/core/main/release-notes/releases-index.json
   DotNetCliVersion: ''                   # optional -- version of the CLI to send to Helix; based on this: https://raw.githubusercontent.com/dotnet/core/main/release-notes/releases-index.json
-  EnableXUnitReporter: false             # optional -- true enables XUnit result reporting to Mission Control
   WaitForWorkItemCompletion: true        # optional -- true will make the task wait until work items have been completed and fail the build if work items fail. False is "fire and forget."
   IsExternal: false                      # [DEPRECATED] -- doesn't do anything, jobs are external if HelixAccessToken is empty and Creator is set
   HelixBaseUri: 'https://helix.dot.net/' # optional -- sets the Helix API base URI (allows targeting int)
@@ -54,7 +53,6 @@ steps:
       IncludeDotNetCli: ${{ parameters.IncludeDotNetCli }}
       DotNetCliPackageType: ${{ parameters.DotNetCliPackageType }}
       DotNetCliVersion: ${{ parameters.DotNetCliVersion }}
-      EnableXUnitReporter: ${{ parameters.EnableXUnitReporter }}
       WaitForWorkItemCompletion: ${{ parameters.WaitForWorkItemCompletion }}
       HelixBaseUri: ${{ parameters.HelixBaseUri }}
       Creator: ${{ parameters.Creator }}
@@ -85,7 +83,6 @@ steps:
       IncludeDotNetCli: ${{ parameters.IncludeDotNetCli }}
       DotNetCliPackageType: ${{ parameters.DotNetCliPackageType }}
       DotNetCliVersion: ${{ parameters.DotNetCliVersion }}
-      EnableXUnitReporter: ${{ parameters.EnableXUnitReporter }}
       WaitForWorkItemCompletion: ${{ parameters.WaitForWorkItemCompletion }}
       HelixBaseUri: ${{ parameters.HelixBaseUri }}
       Creator: ${{ parameters.Creator }}
diff --git a/eng/common/templates/steps/source-build.yml b/eng/common/templates/steps/source-build.yml
index 705b7a1c..ba40dc82 100644
--- a/eng/common/templates/steps/source-build.yml
+++ b/eng/common/templates/steps/source-build.yml
@@ -18,6 +18,35 @@ steps:
     set -x
     df -h
 
+    # If building on the internal project, the artifact feeds variable may be available (usually only if needed)
+    # In that case, call the feed setup script to add internal feeds corresponding to public ones.
+    # In addition, add an msbuild argument to copy the WIP from the repo to the target build location.
+    # This is because SetupNuGetSources.sh will alter the current NuGet.config file, and we need to preserve those
+    # changes.
+    $internalRestoreArgs=
+    if [ '$(dn-bot-dnceng-artifact-feeds-rw)' != '$''(dn-bot-dnceng-artifact-feeds-rw)' ]; then
+      # Temporarily work around https://github.com/dotnet/arcade/issues/7709
+      chmod +x $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh
+      $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh $(Build.SourcesDirectory)/NuGet.config $(dn-bot-dnceng-artifact-feeds-rw)
+      internalRestoreArgs='/p:CopyWipIntoInnerSourceBuildRepo=true'
+
+      # The 'Copy WIP' feature of source build uses git stash to apply changes from the original repo.
+      # This only works if there is a username/email configured, which won't be the case in most CI runs.
+      git config --get user.email
+      if [ $? -ne 0 ]; then
+        git config user.email dn-bot@microsoft.com
+        git config user.name dn-bot
+      fi
+    fi
+
+    # If building on the internal project, the internal storage variable may be available (usually only if needed)
+    # In that case, add variables to allow the download of internal runtimes if the specified versions are not found
+    # in the default public locations.
+    internalRuntimeDownloadArgs=
+    if [ '$(dotnetclimsrc-read-sas-token-base64)' != '$''(dotnetclimsrc-read-sas-token-base64)' ]; then
+      internalRuntimeDownloadArgs='/p:DotNetRuntimeSourceFeed=https://dotnetclimsrc.blob.core.windows.net/dotnet /p:DotNetRuntimeSourceFeedKey=$(dotnetclimsrc-read-sas-token-base64) --runtimesourcefeed https://dotnetclimsrc.blob.core.windows.net/dotnet --runtimesourcefeedkey $(dotnetclimsrc-read-sas-token-base64)'
+    fi
+
     buildConfig=Release
     # Check if AzDO substitutes in a build config from a variable, and use it if so.
     if [ '$(_BuildConfig)' != '$''(_BuildConfig)' ]; then
@@ -29,11 +58,6 @@ steps:
       officialBuildArgs='/p:DotNetPublishUsingPipelines=true /p:OfficialBuildId=$(BUILD.BUILDNUMBER)'
     fi
 
-    internalRuntimeDownloadArgs=
-    if [ '$(dotnetclimsrc-read-sas-token-base64)' != '$''(dotnetclimsrc-read-sas-token-base64)' ]; then
-      internalRuntimeDownloadArgs='--runtimesourcefeed https://dotnetclimsrc.blob.core.windows.net/dotnet --runtimesourcefeedkey $(dotnetclimsrc-read-sas-token-base64)'
-    fi
-
     targetRidArgs=
     if [ '${{ parameters.platform.targetRID }}' != '' ]; then
       targetRidArgs='/p:TargetRid=${{ parameters.platform.targetRID }}'
@@ -49,6 +73,7 @@ steps:
       --restore --build --pack $publishArgs -bl \
       $officialBuildArgs \
       $internalRuntimeDownloadArgs \
+      $internalRestoreArgs \
       $targetRidArgs \
       /p:SourceBuildNonPortable=${{ parameters.platform.nonPortable }} \
       /p:ArcadeBuildFromSource=true
diff --git a/eng/common/tools.ps1 b/eng/common/tools.ps1
index 5d526c74..44484289 100644
--- a/eng/common/tools.ps1
+++ b/eng/common/tools.ps1
@@ -163,6 +163,9 @@ function InitializeDotNetCli([bool]$install, [bool]$createSdkLocationFile) {
   # Disable telemetry on CI.
   if ($ci) {
     $env:DOTNET_CLI_TELEMETRY_OPTOUT=1
+ 
+    # In case of network error, try to log the current IP for reference
+    Try-LogClientIpAddress
   }
 
   # Source Build uses DotNetCoreSdkDir variable
@@ -706,6 +709,8 @@ function MSBuild() {
       Write-PipelineSetVariable -Name 'NUGET_PLUGIN_REQUEST_TIMEOUT_IN_SECONDS' -Value '20'
     }
 
+    Enable-Nuget-EnhancedRetry
+
     $toolsetBuildProject = InitializeToolset
     $basePath = Split-Path -parent $toolsetBuildProject
     $possiblePaths = @(
@@ -714,6 +719,8 @@ function MSBuild() {
       (Join-Path $basePath (Join-Path $buildTool.Framework 'Microsoft.DotNet.Arcade.Sdk.dll')),
       (Join-Path $basePath (Join-Path netcoreapp2.1 'Microsoft.DotNet.ArcadeLogging.dll')),
       (Join-Path $basePath (Join-Path netcoreapp2.1 'Microsoft.DotNet.Arcade.Sdk.dll'))
+      (Join-Path $basePath (Join-Path netcoreapp3.1 'Microsoft.DotNet.ArcadeLogging.dll')),
+      (Join-Path $basePath (Join-Path netcoreapp3.1 'Microsoft.DotNet.Arcade.Sdk.dll'))
     )
     $selectedPath = $null
     foreach ($path in $possiblePaths) {
@@ -750,6 +757,8 @@ function MSBuild-Core() {
     }
   }
 
+  Enable-Nuget-EnhancedRetry
+
   $buildTool = InitializeBuildTool
 
   $cmdArgs = "$($buildTool.Command) /m /nologo /clp:Summary /v:$verbosity /nr:$nodeReuse /p:ContinuousIntegrationBuild=$ci"
@@ -872,3 +881,36 @@ if (!$disableConfigureToolsetImport) {
     }
   }
 }
+
+function Try-LogClientIpAddress()
+{
+    Write-Host "Attempting to log this client's IP for Azure Package feed telemetry purposes"
+    try
+    {
+        $result = Invoke-WebRequest -Uri "http://co1.msedge.net/fdv2/diagnostics.aspx" -UseBasicParsing
+        $lines = $result.Content.Split([Environment]::NewLine) 
+        $socketIp = $lines | Select-String -Pattern "^Socket IP:.*"
+        Write-Host $socketIp
+        $clientIp = $lines | Select-String -Pattern "^Client IP:.*"
+        Write-Host $clientIp
+    }
+    catch
+    {
+        Write-Host "Unable to get this machine's effective IP address for logging: $_"
+    }
+}
+
+#
+# If $ci flag is set, turn on (and log that we did) special environment variables for improved Nuget client retry logic.
+#
+function Enable-Nuget-EnhancedRetry() {
+    if ($ci) {
+      Write-Host "Setting NUGET enhanced retry environment variables"
+      $env:NUGET_ENABLE_EXPERIMENTAL_HTTP_RETRY = 'true'
+      $env:NUGET_EXPERIMENTAL_MAX_NETWORK_TRY_COUNT = 6
+      $env:NUGET_EXPERIMENTAL_NETWORK_RETRY_DELAY_MILLISECONDS = 1000
+      Write-PipelineSetVariable -Name 'NUGET_ENABLE_EXPERIMENTAL_HTTP_RETRY' -Value 'true'
+      Write-PipelineSetVariable -Name 'NUGET_EXPERIMENTAL_MAX_NETWORK_TRY_COUNT' -Value '6'
+      Write-PipelineSetVariable -Name 'NUGET_EXPERIMENTAL_NETWORK_RETRY_DELAY_MILLISECONDS' -Value '1000'
+    }
+}
diff --git a/eng/common/tools.sh b/eng/common/tools.sh
index 828119be..6a4871ef 100755
--- a/eng/common/tools.sh
+++ b/eng/common/tools.sh
@@ -399,6 +399,13 @@ function StopProcesses {
   return 0
 }
 
+function TryLogClientIpAddress () {
+  echo 'Attempting to log this client''s IP for Azure Package feed telemetry purposes'
+  if command -v curl > /dev/null; then
+    curl -s 'http://co1.msedge.net/fdv2/diagnostics.aspx' | grep ' IP: ' || true
+  fi
+}
+
 function MSBuild {
   local args=$@
   if [[ "$pipelines_log" == true ]]; then
@@ -410,6 +417,13 @@ function MSBuild {
       export NUGET_PLUGIN_REQUEST_TIMEOUT_IN_SECONDS=20
       Write-PipelineSetVariable -name "NUGET_PLUGIN_HANDSHAKE_TIMEOUT_IN_SECONDS" -value "20"
       Write-PipelineSetVariable -name "NUGET_PLUGIN_REQUEST_TIMEOUT_IN_SECONDS" -value "20"
+
+      export NUGET_ENABLE_EXPERIMENTAL_HTTP_RETRY=true
+      export NUGET_EXPERIMENTAL_MAX_NETWORK_TRY_COUNT=6
+      export NUGET_EXPERIMENTAL_NETWORK_RETRY_DELAY_MILLISECONDS=1000
+      Write-PipelineSetVariable -name "NUGET_ENABLE_EXPERIMENTAL_HTTP_RETRY" -value "true"
+      Write-PipelineSetVariable -name "NUGET_EXPERIMENTAL_MAX_NETWORK_TRY_COUNT" -value "6"
+      Write-PipelineSetVariable -name "NUGET_EXPERIMENTAL_NETWORK_RETRY_DELAY_MILLISECONDS" -value "1000"
     fi
 
     local toolset_dir="${_InitializeToolset%/*}"
@@ -420,6 +434,8 @@ function MSBuild {
     possiblePaths+=( "$toolset_dir/$_InitializeBuildToolFramework/Microsoft.DotNet.Arcade.Sdk.dll" )
     possiblePaths+=( "$toolset_dir/netcoreapp2.1/Microsoft.DotNet.ArcadeLogging.dll" )
     possiblePaths+=( "$toolset_dir/netcoreapp2.1/Microsoft.DotNet.Arcade.Sdk.dll" )
+    possiblePaths+=( "$toolset_dir/netcoreapp3.1/Microsoft.DotNet.ArcadeLogging.dll" )
+    possiblePaths+=( "$toolset_dir/netcoreapp3.1/Microsoft.DotNet.Arcade.Sdk.dll" )
     for path in "${possiblePaths[@]}"; do
       if [[ -f $path ]]; then
         selectedPath=$path
diff --git a/global.json b/global.json
index c3952169..7689675f 100644
--- a/global.json
+++ b/global.json
@@ -3,7 +3,7 @@
     "allowPrerelease": true
   },
   "tools": {
-    "dotnet": "6.0.100-preview.6.21355.2",
+    "dotnet": "6.0.100",
     "runtimes": {
       "dotnet": [
         "3.1.14"
@@ -14,6 +14,6 @@
     }
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "6.0.0-beta.21379.2"
+    "Microsoft.DotNet.Arcade.Sdk": "7.0.0-beta.21559.3"
   }
 }